JP2002101375A - Device and method for reproducing information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a frame feeding mode at the time of reproducing continuous image data and to reduce processing time by pre-reading at the time of reproducing the other data. SOLUTION: Whether or not a disk 18 is a video disk on which the image data are continuously recorded is discriminated by the control of a CPU 1, when the disk 18 is the video disk, a reproduction retry is carried out in the vicinity of an error sector where a reproduction error occurs at the time when the reproduction error occurs during pre-reading data on the disk 18, and when the disk 18 is not the video disk, pre-reading processing is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a DVD-RO.
The present invention relates to an information reproducing apparatus such as an optical disk drive that reproduces information on a recording medium such as M, CD-R / RW and outputs the information to a host computer.

[0002]

2. Description of the Related Art Conventionally, an information reproducing apparatus (for example, in particular, Japanese Patent Application Laid-Open Publication No. H10-163122) reduces the time required to read information from a CD-ROM disk by optimizing the amount of prefetching of information from a CD-ROM disk to a value as small as possible. Kaihei 5
174489).

In such an information reproducing apparatus, the information (data) on the disk is pre-read, and when the data of the reproduction address in the next reproduction command from the host computer is in the pre-read range and is in the buffer memory, Then, the data read from the buffer memory is transferred to the host computer. If the data of the reproduction address is not in the buffer memory, the data is reproduced directly from the disk and transferred to the host computer.

[0004] When a data error occurs during reproduction of a DVD video disk due to contamination of the disk surface or the like, the reproduction process is stopped and the reproduction retry is not performed. That is, since the normal reproduction retry is effective for the reproduction address in the reproduction instruction, if the reproduction of the address in the reproduction instruction becomes an error, a predetermined reproduction retry is performed to increase the data reproduction probability. Also, the reproduction retry for prefetching is not considered in the host interface standard.

[0005]

However, a DVD video disk (DV) using the information reproducing apparatus as described above.
In the reproduction of a recording medium on which image data such as D-Video Disc) is continuously recorded, the reproduction command from the host computer is of course continuous address reproduction. Therefore, it is necessary to always pre-read the image data. ,
The reproduced video is framed.

That is, in the case of a DVD video disk, since the data recording density on the disk is high, a reproduction retry must be performed even if pre-reading ends with an error, and sufficient image data must always be stored in the buffer memory. However, if image data is read from the disk when a reproduction command is received from the host computer, there is a problem that the transfer of the image data cannot be made in time and the reproduced video is in a frame-by-frame state.

[0007] In addition, a video disc (Video Di
In discs other than sc), there are many directories and files, and the files are not always recorded continuously. Therefore, the reproduction address in the reproduction command from the host computer is not continuous, and the prefetch range In many cases, reproduction of an outside area is requested.If there is no address requested to be reproduced within the prefetch range, prefetching must be intentionally stopped and reproduced from the target address on the disc. On the contrary, there is a problem that the regeneration efficiency is reduced when the method is implemented.

As described above, in reproducing a disk such as a DVD disk on which image data is recorded, pre-reading of data is indispensable. When data is not cached, the data is read directly from the disk, and reproduced video is framed. If an error occurs during pre-reading, a retry is performed, and the pre-reading is repeated and the data is transferred from the buffer memory to the host computer. It is essential not to make useless time such as reading.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is possible to prevent a reproduced video from being frame-advanced when image data is continuously reproduced, and to perform pre-reading when reproducing other data. The purpose is to reduce processing time.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention reproduces information recorded on a recording medium,
In an information reproducing apparatus for transferring the reproduced information to a host computer, a recording medium determining means for determining whether the recording medium is a recording medium on which image data is continuously recorded, and a pre-reading of information on the recording medium When a reproduction error occurs during the reproduction, a reproduction retry is performed from the vicinity of the error sector where the reproduction error has occurred on the recording medium on which the image data determined by the recording medium determination means is continuously recorded, and the image data is reproduced. Is provided with a pre-reading control means for stopping the pre-reading process on a recording medium other than the recording medium on which is recorded.

In the above information reproducing apparatus, when the area code and the copy protection information are recorded in a predetermined area on the recording medium, the image data is stored in the recording medium discriminating means. It is preferable to provide a means for determining that the recording medium has been recorded continuously.

Further, in the information reproducing apparatus as described above, the recording medium discriminating means may issue a reproduction command having a reproduction address continuous to the recording medium determined not to be the recording medium on which the image data is recorded, for a predetermined number of times. It is preferable to provide means for re-determining that the recording medium is a recording medium on which image data is recorded when the recording medium is continuously issued.

Further, in the information reproducing apparatus as described above, it is preferable to provide a means for starting retry reproduction from a head address of a block group which is a predetermined reproduction unit when performing the reproduction retry.

Further, in the information reproducing apparatus as described above, it is preferable to provide a means for delaying the start timing of pre-reading of the recording medium on which the image data is continuously recorded on the other recording medium.

Further, in the information reproducing apparatus as described above, when prefetching a recording medium on which the image data is continuously recorded, data transferred in response to a reproduction command last received from the host computer is read. Means for holding may be provided.

According to another aspect of the present invention, there is provided an information reproducing method for reproducing information recorded on a recording medium and transferring the reproduced information to a host computer, wherein the recording medium is a recording medium on which image data is continuously recorded. When a reproduction error occurs during pre-reading of the information on the recording medium, the recording medium on which the discriminated image data is continuously recorded is reproduced from the vicinity of the error sector where the reproduction error occurs. It is preferable to execute the retry and stop the pre-reading process on a recording medium other than the recording medium on which the image data is recorded.

Further, in the information reproducing method as described above, when the area code and the copy protection information are recorded in a predetermined area specified in advance on the recording medium, the recording in which the image data is continuously recorded is performed. It may be determined that the medium is a medium.

In the information reproducing method as described above, when a reproduction command having a continuous reproduction address is continuously issued for a predetermined number of times or more on a recording medium determined not to be the recording medium on which the image data is recorded. The recording medium may be re-determined as a recording medium on which image data is recorded.

Further, in the above-described information reproducing method, when performing the reproduction retry, it is preferable to start the retry reproduction from a head address of a block group which is a predetermined reproduction unit.

In the information reproducing method as described above, the start timing of pre-reading of a recording medium on which image data is continuously recorded on other recording mediums may be delayed.

Further, in the information reproducing method as described above, when prefetching a recording medium on which the image data is continuously recorded, the data transferred in accordance with the last reproduction command command received from the host computer is held. Good to do.

[0022]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a DVD drive device according to an embodiment of the present invention.

This DVD drive is realized by a microcomputer, and includes a CPU 1, a nonvolatile memory 2, and a host interface controller (HOST I / O).
/ FCONTROLR3) 3, BUFFER MANAGER 4, buffer memory 5, subcode operation controller (SUBC)
ODE OPERATION CONTROLLER)
6, CD-ROM encoder (CD-ROM ENCO
RDER) 7, memory 8, CD-ROM decoder (CD
-ROM DECODER 9, audio controller (AUDIO CONTROLLER) 10, system controller (SYSTEM CONTROLLE)
R) 11, CD encoder (CD ENCODER)
12. CD / DVD decoder (CD / DVD DECO
RDER) 13, servo unit (SERVO) 14, spindle controller (SPINDLE CONTROLLL)
ER) 15 and an ATA via an ATAPI bus 16
A disk 18 is connected to the host computer 17 via a PI interface (ATAPI I / F).
Play the above data.

The CPU 1 is a central processing LSI such as a user microcontroller (User Micro Controller), and controls all operations of the DVD drive device and executes control processing for realizing functions according to the present invention. The nonvolatile memory 2 has a flash RO
This is a nonvolatile memory in which the CPU 1 such as M (Flash ROM) can erase and rewrite data contents.

The host I / F controller 3 is an LSD for performing data communication between the host computer 17 and the DVD drive. Buffer Manager 4
Is an LSI for controlling transfer of transfer data from the host computer 17 and data read from the disk 18.
It is.

The buffer memory 5 is a memory such as a DRAM for temporarily storing transfer data from the host computer 17 and data read from the disk 18. The subcode operation controller 6 controls the disk 18
A subcode to be recorded on the disk 18 is generated, and a subcode read from the disk 18 is separated (SUBP, Q, R,
.., W).

The CD-ROM encoder 7 is a CD-RO encoder.
This is an LSI that modulates M data before writing it on the disk 18. The memory 8 is an SRAM for storing program variables and the like.
And the like. The CD-ROM decoder 9 is an LS for demodulating CD-ROM data reproduced from the disk 18.
I.

The audio controller 10 is an LSI for controlling music reproduction. The system controller 11 is an LSI that controls recording and reproduction of information on the disk 18. The CD encoder 12 is an LSI that modulates user data and subcodes before recording information on the disk 18 so as to conform to the disk standard.

[0029] The CD / DVD decoder 13
LSI (CD) that separates and demodulates information reproduced from disk 8 into user data and subcodes, and an LSI (DD) that decodes information reproduced from disk 18 as user data.
VD). The servo unit 14 controls the positioning of the pickup (not shown) with respect to the disk 18.

The spindle controller 15 is an LSI for controlling the rotation of the disk 18. ATAPI bus 1
Reference numeral 6 denotes a communication line for performing data transfer with the host computer 17 based on the ATAPI interface standard.

The host computer 17 has a CPU, an RO,
Built-in microcomputer consisting of M, RAM, etc.
Processing such as video reproduction based on the data transferred from the DVD drive, generation of data to be recorded on the disk 18, and transfer to the DVD drive are performed. The disk 18 is an information recording medium, such as a CD-ROM,
-R / RW, DVD-ROM, DVD-R / RW, DV
An optical disk such as a D-RAM.

That is, the DVD drive device corresponds to an information reproducing device that reproduces information recorded on a recording medium and transfers the reproduced information to a host computer.

Further, the CPU 1 or the like determines whether or not the recording medium is a recording medium on which image data is continuously recorded, and a recording medium discriminating means for determining whether a reproduction error occurs during pre-reading of information on the recording medium. For a recording medium on which the image data determined by the recording medium determination means is continuously recorded, a reproduction retry is performed from near an error sector where a reproduction error has occurred, and recording is performed on a recording medium other than the recording medium on which the image data is recorded. It functions as a prefetch control unit that stops prefetch processing for a medium.

Further, when the area code and the copy protection information are recorded in a predetermined area on the recording medium, a function of a means for judging that the recording medium is a recording medium on which image data is continuously recorded is provided. Fulfill.

When a reproduction command having a continuous reproduction address is continuously issued for a predetermined number of times with respect to a recording medium determined not to be a recording medium on which image data is recorded, the image data is recorded on the recording medium. It functions as a means for re-determining that the recording medium is a recorded medium.

Further, when the reproduction retry is carried out, it functions as a means for starting the retry reproduction from a head address of a block group which is a predetermined reproduction unit. Also, it functions as a means for delaying the start timing of the pre-reading of the recording medium on which the image data is continuously recorded with respect to the other recording medium.

Further, when pre-reading a recording medium on which image data is continuously recorded, it functions as means for holding data transferred in response to a reproduction command command received last from the host computer.

Further, an information reproducing method for reproducing information recorded on a recording medium and transferring the reproduced information to a host computer is realized by control processing of the CPU 1 or the like.

Further, it is determined whether or not the recording medium is a recording medium on which image data is continuously recorded. If a reproduction error occurs during pre-reading of information on the recording medium, the determined image data is continuously recorded. The reproduction retry is performed from the vicinity of the error sector where the reproduction error has occurred on the recording medium on which the recording has been performed, and the pre-reading process is stopped on the recording medium other than the recording medium on which the image data is recorded.

Further, when the area code and the copy protection information are recorded in a predetermined area specified in advance on the recording medium, it is determined that the recording medium has the image data continuously recorded.

Further, when a reproduction command having a continuous reproduction address is continuously issued for a predetermined number of times or more on a recording medium determined not to be a recording medium on which image data is recorded,
It is determined again that the recording medium is a recording medium on which image data is recorded.

When the reproduction retry is performed, the retry reproduction is started from the head address of the block group, which is a predetermined reproduction unit. Further, the start timing of the pre-reading for the other recording media with respect to the recording media on which the image data is continuously recorded is delayed.

Further, when pre-reading a recording medium on which image data is continuously recorded, data transferred in response to a reproduction command last received from the host computer is held.

Next, a description will be given of a reproduction process according to the first and seventh aspects of the present invention in the DVD drive device. FIG. 2 is a flowchart showing a reproducing process in the DVD drive device according to the first and seventh aspects of the present invention.

In this reproduction processing, when the inserted disk 18 is a video disk, when a reproduction error occurs during pre-reading, the pre-reading processing is performed again (pre-reading retry), and the buffer memory 5 becomes empty. Perform prefetching as much as possible.

By executing this reproduction processing, data is stored in the buffer memory 5 before the reproduction request from the host computer 17 arrives, and the data is transferred from the buffer memory 5 so that the movie is transferred. In this way, it is possible to avoid a frame-feeding state during video reproduction.

This processing is performed by the steps shown in FIG.
When a read command (Read Command), which is a disc reproduction command, is received from the host computer at 1), the command is analyzed at step 2 and a reproduction process is performed.

If there is data in the buffer memory in step 3, data transfer from the buffer memory to the host computer through the ATAPI bus 16 is performed. If the requested sector data does not exist in the buffer memory, reproduction processing from the disk is performed, and the requested sector data is transferred to the host computer.

In step 4, it is checked whether or not there is a predetermined number or more of free areas in the buffer memory. If there is no free area in the buffer memory, the reproduction process is terminated.

If there is a free space in the buffer memory as determined in step 4, data is reproduced from the next address of the sector requested by the host computer in step 5, a pre-read process is performed, and the data is stored in the buffer memory. Is stored. Wait for the reproduction process to end in step 6,
When the reproduction is completed, the process proceeds to step S7. When the playback ends,
The CPU recognizes when there is no more space in the buffer memory or when a reproduction error has occurred.

In step 7, it is determined whether or not a reproduction error has occurred as a confirmation of the termination condition. If a reproduction error has occurred, it is determined in step 8 whether the inserted disk is a video disk on which image data is continuously recorded. It is determined whether or not.

If it is determined in step 8 that the disk is a video disk, the flow returns to step 5 to execute the pre-reading process again, and to retry the reproduction from the vicinity of the error sector where the reproduction error has occurred.

On the other hand, if it is determined in step 8 that the disc is a disc other than the video disc, the pre-reading process is stopped, and the reproducing process is terminated. If it is determined in step 7 that there is no reproduction error, and if the buffer memory is full and pre-reading has been completed normally, this processing is terminated normally.

In the case where the inserted disk 18 is a video disk in which image data is continuously recorded in this way, since the data on the disk 18 is always in the buffer memory 5, for example, when the movie is played back, It is possible to avoid such a problem that a state occurs. Further, it is possible to reduce processing time by performing useless pre-reading processing on disks other than video disks.

Next, processing of the DVD drive device according to claims 2 and 8 of the present invention will be described.
A DVD video disk is famous as the video disk, and the above-described read-ahead process is preferably performed for a video disk separately from a DVD disk and other video disks.

First, the area code and copy protection information recorded on the DVD video disc relating to this processing will be described. Area code: The DVD video disc sets an area where the disc can be played. D
The VD drive device also stores an area code, and can reproduce when the area code matches the area code of the disc.

For example, a DVD video disc on which DVD software purchased in the United States is recorded cannot be reproduced in Japan. However, rewriting of the area code of the drive is permitted up to five times, and a rewritable drive device can reproduce a DVD of another country.

Copy protection information: This information is stored in CS
As part of the S standard, copyright materials (Cop
On a disk recorded as “yield Material”, data is recorded in a scrambled manner, and data such as a movie cannot be reproduced without decrypting the data.

FIG. 3 is a flow chart showing a process according to claims 2 and 8 of the present invention in the DVD drive device. In this process, it is determined whether or not the inserted disk 18 is a DVD video disk.

When a disc is inserted in step 11, a disc information mounting process is performed, and in step 12
To determine whether the disc is a DVD video disc or not.
If it is determined that the disk is a video disk, the copyright information sector (Co
Pyright Information Secto
Play r).

The copyright information sector is stored in the lead-in area (Lea) of the DVD video disk.
d-In Area) where copyright information (copy protection information) is recorded.

At step 14, the area code is obtained from the copyright information sector, and at step 15, the copyright information is obtained. The area code of the disk 18 is
DV when it matches the region code of DVD drive
D playback becomes possible, which is a means for copyright protection.

In step 16, it is determined whether or not the area code has been recorded. If the area code has been recorded, it is determined in step 17 whether or not the material is copyright material. Sets the video disc flag in step 18 and ends this processing.

If the area code is not recorded in the judgment of step 16, the process is terminated without setting the flag. This process is also terminated when it is determined in step 17 that the disc is not copy material. Thus, the DVD video disk can be determined.

Next, the processing according to the third and ninth aspects of the present invention in the DVD drive device will be described.
The region code is set in the video disc,
Some discs are not copy-protected.

FIG. 4 is a flowchart showing the processing according to the third and ninth aspects of the present invention in the DVD drive device. In this process, the disc type discriminating process is further enhanced so that a DVD video disc that is not copyright material can be discriminated.

In this process, when a reproduction command is received from the host computer in step 21, a reproduction start address and a reproduction length included in the command code are obtained in step 22. In step 23, it is confirmed whether or not the reproduction start address is next to the last address in the previous reproduction instruction and the reproduction addresses are continuous.

If it is determined in step 23 that the reproduction addresses of the reproduction commands are continuous, the continuation flag is incremented by one in step 24. If it is determined in step 23 that the reproduction addresses are not continuous, the continuity flag is cleared in step 27, and this processing ends.

After setting the continuous flag in step 24,
In step 25, it is confirmed whether or not the value of the continuous flag exceeds a predetermined number set in advance. If the value does not exceed the predetermined number, this processing is terminated as it is. Set the video disc flag with
This processing ends.

As described above, when a continuous reproduction address continues, it is determined that the disk is a DVD video disk, and a video disk that is not copy protected can also be determined and prefetching can be performed.

Next, the processing of the DVD drive device according to claims 4 and 10 of the present invention will be described.

In the case of a DVD disk, data is recorded in units of ECC blocks (ECC blocks).
The ECC block is composed of 16 sectors,
Parity sectors are generated for the 16 sectors.

Then, at the time of reproduction, reproduction is performed in units of ECC blocks, and it is possible to determine whether there is an error in the ECC block only after reproducing 16 sectors. Therefore, if a data error occurs in the middle of the ECC block, the buffer memory 5
Error ECC block (ERROR EC)
The sector data up to the error address in the C Block is not guaranteed.

For example, if a data error occurs in the 10th ECC block, the data in the 9 sectors immediately before the error sector is not guaranteed, so that the ECC block buffered in the buffer memory 5 cannot be used. Therefore, it is preferable to start reproduction from the head address of the ECC block in the reproduction retry in the pre-reading.

In this process, when a retry of reproduction is performed in the above-described reproduction process, retry reproduction is started from a head address of an ECC block (a block group that is a predetermined reproduction unit).

In this manner, the E
In the case of a disc that plays back in CC block units, ECC
Even if an error ends in the middle of a block, reproduction is started again from the head address of the ECC block, so that the reliability of ECC block reproduction is improved.

Next, the processing according to the fifth and eleventh aspects of the present invention in the DVD drive device will be described. When the inserted disk is a video disk, if there is a free space in the buffer memory 5, it is necessary to start prefetching immediately.

On the other hand, if the disc is not a video disc, the file position is often not continuous, and the probability that the pre-read data can be transferred to the host computer 17 is lower than that of a video disc. In the case of data other than video data, since the command interval of the reproduction command from the host computer 17 is longer than that in the case of a video disc, it is not necessary to frequently perform prefetching. Frequent pre-reading will rather increase wasteful power consumption.

Therefore, in the case of a disk other than a video disk, for example, when the free space of the buffer memory 5 is reduced to about half, prefetching is performed, and the prefetching execution timing may be delayed.

FIG. 5 is a flowchart showing a process according to the fifth and eleventh aspects of the present invention in the DVD drive device. In this process, the start timing of prefetching is switched depending on whether the disc is a video disc or not. This process eliminates frequent prefetching for discs other than video discs, thereby suppressing unnecessary power consumption. .

In this process, after receiving a playback command from the host computer in step 31 and performing a series of playback processes such as disk playback and data transfer, in step 32 the free space in the buffer memory is confirmed. It is determined whether or not the disc inserted is a video disc.

If it is determined in step 33 that the video disk is a video disk, it is determined in step 34 whether or not the confirmed free space in the buffer memory is larger than a predetermined value X for the video disk. The pre-reading is started, and this processing ends. If the free space is equal to or smaller than X in the determination at step 34, the process is terminated without performing the prefetching process.

On the other hand, if it is not determined at step 33 that the disc is a DVD video disc, then at step 36 it is determined whether or not the free space in the buffer memory is larger than a predetermined value Y for dirt other than a video disc. If it is determined that the size is larger, the pre-reading process is started in step 35, and this process ends. If the free space is determined to be equal to or smaller than Y in step 36, the process ends without performing the prefetching process.

For example, when reproducing a DVD video disk, the data in the buffer memory 5 of 2 megabytes (Mbytes) becomes empty in a few seconds, so that the buffer memory 5 must be used effectively. . Therefore, when the buffer memory 5 is vacant, prefetching must be started immediately. Therefore, the predetermined value (threshold) X is preferably set to a value considerably smaller than the predetermined value (threshold) Y.

As described above, during reproduction of a disc other than a video disc, it is not necessary to frequently read ahead, so that wasteful power consumption can be suppressed.

Next, a description will be given of a reproducing process according to the sixth and twelfth aspects of the present invention in the DVD drive device. For example, some application software for playing back video data may cause the data transferred to the host computer 17 to be transferred again by the next playback command. However, the buffered transfer data is
Since the data is overwritten on the buffer memory 5 by the pre-reading operation, it must be reproduced from the disk 18 again, and the reproduced video such as a movie is in a frame-by-frame state. Therefore, even if the same data transfer is requested again from the host computer, it is preferable not to reproduce the disk 18 again.

FIG. 6 is a flowchart showing a reproducing process in the DVD drive device according to claims 6 and 12 of the present invention. In this process, the data transferred by the last playback command received from the host computer is held in the buffer memory 5, and in this manner, the data transferred to the host computer 17 is again stored by the next playback command. Even with DVD playback software (S / W) to be transferred, smooth video playback can be achieved.

In this process, when a playback command is received from the host computer in step 41, a command descriptor block (Command Desert) is sent in step 42.
The reproduction address and the regrowth are obtained from the Script Block (CDB), and a series of reproduction instruction processing is executed in step 43.

In step 44, it is determined whether or not there is a free area in the buffer memory.
In step 5, it is determined whether the inserted disk is a video disk.

At step 45, a video disc (for example,
If it is determined to be a DVD video disk), in step 46, a prefetch end buffer address on the buffer memory is calculated, and the prefetch end buffer address is set in the buffer manager.

The last area (reproduction length Z) of the empty area of the buffer memory 5 is stored by using the reproduction address and the reproduction length Z obtained in step 42 based on the prefetch end buffer address on the buffer memory 5. By doing so, when the reproduction data is transferred to the host computer 17, the area of the buffer memory 5 where the data is stored becomes empty, but this area is not regarded as an empty area.

After the calculation of the prefetch end buffer address on the buffer memory is completed in step 46 and set in the buffer manager, prefetch processing is started and executed in step 47.

If there is no free space in the buffer memory at step 44, this process ends. Further, if it is not determined in step 45 that the disc is a video disk, the pre-reading process is started and executed in step 47 without calculating the pre-reading end buffer address, and this process ends.

Thus, the buffer memory 5 usually has
Although the data to be transferred to the host computer 17 is temporarily stored, the area immediately before the first data waiting to be transferred to the host computer 17 becomes a free area.

As described above, since the data transferred immediately before to the host computer 17 is retained thereafter, even if application software for transferring the data transferred to the host computer 17 again by the next reproduction instruction is used,
It is not necessary to read data from the disk 18 again, so that it is possible to improve the reproduction efficiency and prevent the occurrence of a problem that the reproduced video such as a movie is in a frame feed state.

In the above embodiment, the DVD-ROM
The drive device has been described as an example.
-It can be similarly applied to a drive device for reproducing other information recording media such as a ROM drive device, a CD-R / RW drive device, and the like.

[0097]

As described above, according to the information reproducing apparatus and the information reproducing method of the present invention, it is possible to prevent the frame advance state during continuous image data reproduction, and to pre-read when reproducing other data. Can reduce processing time.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a DVD drive device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a reproduction process according to claims 1 and 7 of the present invention in the DVD drive device shown in FIG. 1;

FIG. 3 is a flowchart showing a reproduction process according to claims 2 and 8 of the present invention in the DVD drive device shown in FIG. 1;

FIG. 4 is a flowchart showing a reproduction process according to the third and ninth aspects of the present invention in the DVD drive device shown in FIG. 1;

FIG. 5 is a flowchart showing a reproduction process according to claims 5 and 11 of the present invention in the DVD drive device shown in FIG. 1;

FIG. 6 is a flowchart showing a reproducing process according to claims 6 and 12 of the present invention in the DVD drive device shown in FIG. 1;

[Explanation of symbols]

 1: CPU 2: Non-volatile memory 3: Host interface controller 4: Buffer manager 5: Buffer memory 6: Subcode operation controller 7: CD-ROM encoder 8: Memory 9: CD-ROM decoder 10: Audio controller 11: System controller 12: CD encoder 13: CD / DVD decoder 14: Servo unit 15: Spindle controller 16: ATAPI bus 17: Host computer 18: Disk

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 20/18 512 G11B 20/18 512Z 552 552F 572 572C 572F 27/10 27/10 A H04N 5/937 H04N 5/93 CF term (Reference) 5B065 BA03 CE11 CH05 EA04 5C052 AA02 AB04 AC10 CC06 DD04 5C053 FA13 FA23 FA24 GB15 HA33 JA21 LA11 5D044 AB05 AB07 BC03 CC05 DE49 DE50 DE69 DE83 FG10 FG18 GK07 GK12 HL11 5D0A EA11

Claims (12)

[Claims] 1. reproducing information recorded on a recording medium,
In an information reproducing apparatus for transferring the reproduced information to a host computer, a recording medium determining unit for determining whether the recording medium is a recording medium on which image data is continuously recorded, and a pre-reading of information on the recording medium When a reproduction error occurs during the reproduction, a reproduction retry is performed from the vicinity of the error sector where the reproduction error has occurred on the recording medium on which the image data determined by the recording medium determination unit is continuously recorded, and the image data is reproduced. An information reproducing apparatus, comprising: a read-ahead control unit for stopping a pre-read process on a recording medium other than a recording medium on which is recorded. 2. An information reproducing apparatus according to claim 1, wherein said recording medium discriminating means stores the image data when a region code and copy protection information are recorded in a predetermined area specified in advance on said recording medium. An information reproducing apparatus, comprising: means for determining that a recording medium is a recording medium on which information is continuously recorded. 3. The information reproducing apparatus according to claim 1, wherein said recording medium discriminating means is provided with a reproduction command in which reproduction addresses are consecutively read from a recording medium determined to be not a recording medium on which said image data is recorded. An information reproducing apparatus, comprising: means for re-determining a recording medium as a recording medium on which image data has been recorded, when the recording medium has been issued continuously for a number of times or more. 4. The information reproducing apparatus according to claim 1, wherein, when the reproduction retry is performed, retry reproduction is performed from a head address of a block group which is a predetermined reproduction unit. An information reproducing apparatus characterized by comprising means for starting. 5. The information reproducing apparatus according to claim 1, wherein a means for delaying the start timing of pre-reading of a recording medium on which image data is continuously recorded is performed on the other recording medium. An information reproducing apparatus, comprising: 6. The information reproducing apparatus according to claim 1, wherein a read command last received from the host computer when prefetching a recording medium on which the image data is continuously recorded. An information reproducing apparatus comprising means for holding data transferred in response to a command. 7. Reproducing information recorded on a recording medium,
In the information reproducing method for transferring the reproduced information to a host computer, it is determined whether the recording medium is a recording medium on which image data is continuously recorded, and a reproduction error occurs during pre-reading of information on the recording medium. When this occurs, for the recording medium on which the determined image data is continuously recorded, a reproduction retry is performed from the vicinity of the error sector where the reproduction error has occurred, and the recording medium other than the recording medium on which the image data is recorded is recorded. An information reproducing method characterized in that the prefetching process is stopped. 8. The information reproducing method according to claim 7, wherein the image data is continuously recorded when the area code and the copy protection information are recorded in a predetermined area specified in advance on the recording medium. An information reproducing method characterized by determining that the medium is a recording medium. 9. The information reproducing method according to claim 7, wherein a reproduction command having a continuous reproduction address is continuously issued a predetermined number of times or more on a recording medium determined to be not the recording medium on which the image data is recorded. An information reproducing method characterized by re-determining the recording medium as a recording medium on which image data is recorded. 10. The information reproducing method according to claim 7, wherein when performing the reproduction retry, retry reproduction is performed from a head address of a block group which is a predetermined reproduction unit. An information reproducing method characterized by starting. 11. The information reproducing method according to claim 7, wherein a start timing of pre-reading of a recording medium on which image data is continuously recorded is pre-read for another recording medium. An information reproducing method characterized by the following. 12. The information reproducing method according to claim 7, wherein a read command last received from the host computer when pre-reading a recording medium on which the image data is continuously recorded. An information reproducing method characterized by holding data transferred in response to a command.